Implement map_hgvs

[dameyerdave]

• depending on an additional microservice or existing API to convert HGVS to g notation

[anastasia-escher]

@dameyerdave, does this do the job?

[dameyerdave]

Eventually based on the AlleleRegistry api: https://reg.clinicalgenome.org/redmine/projects/registry/genboree_registry/landing

API reference: http://reg.clinicalgenome.org/doc/AlleleRegistry_1.01.xx_api_v1.pdf